httpclient4.3.x類比post及get請求

標籤：web開發   httpclient4.3.x   httpcomponents   

在web開發中,我們經常需要類比post及get請求,現在網上比較多的是使用httpclient3.x,然而httpclient4.x已經發布好幾年了,而且4.x之後改名為HttpComponents,顯然是今後的趨勢.
Apache HttpComponents4.x中的HttpClient是一個很好的工具,它符合HTTP1.1規範，是基於HttpCore類包的實現。但是HttpComponents4.x較之前httpclient3.x的API變化比較大,已經分為HttpClient,HttpCore,HttpAsyncClient等多個組件,在類比post及get請求時的編碼也出現了較大的變化.

下面是httpclient4.3.4類比get請求的常式

public void requestGet(String urlWithParams) throws Exception {        CloseableHttpClient httpclient = HttpClientBuilder.create().build();                //HttpGet httpget = new HttpGet("http://www.baidu.com/");        HttpGet httpget = new HttpGet(urlWithParams);           //配置請求的逾時設定        RequestConfig requestConfig = RequestConfig.custom()                  .setConnectionRequestTimeout(50)                .setConnectTimeout(50)                  .setSocketTimeout(50).build();          httpget.setConfig(requestConfig);                CloseableHttpResponse response = httpclient.execute(httpget);                System.out.println("StatusCode -> " + response.getStatusLine().getStatusCode());                HttpEntity entity = response.getEntity();                String jsonStr = EntityUtils.toString(entity);//, "utf-8");        System.out.println(jsonStr);                httpget.releaseConnection();}

httpclient4.3.4類比post請求的常式

public void requestPost(String url,List<NameValuePair> params) throws ClientProtocolException, IOException {    CloseableHttpClient httpclient = HttpClientBuilder.create().build();            HttpPost httppost = new HttpPost(url);        httppost.setEntity(new UrlEncodedFormEntity(params));                CloseableHttpResponse response = httpclient.execute(httppost);        System.out.println(response.toString());                HttpEntity entity = response.getEntity();        String jsonStr = EntityUtils.toString(entity, "utf-8");        System.out.println(jsonStr);                httppost.releaseConnection();}

運行post方法時,可以

public static void main(String[] args){    try {        String loginUrl = "http://localhost:8080/yours";        List<NameValuePair> params = new ArrayList<NameValuePair>();        params.add(new BasicNameValuePair("name", "zhang"));        params.add(new BasicNameValuePair("passwd", "123"));                    requestPost(loginUrl,params);    } catch (ClientProtocolException e) {        e.printStackTrace();    } catch (IOException e) {        e.printStackTrace();    }}

最後給出httpcomponents官網的常式
http://hc.apache.org/httpcomponents-core-4.3.x/examples.html